/*	$OpenBSD: stat.c,v 1.23 2018/09/18 15:14:06 tb Exp $ */
/*	$NetBSD: stat.c,v 1.19 2004/06/20 22:20:16 jmc Exp $ */

/*
 * Copyright (c) 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Andrew Brown.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "compat.h"

#define DEF_FORMAT                                      \
  "%d %i %Sp %l %Su %Sg %r %z \"%Sa\" \"%Sm\" \"%Sc\" " \
  "%k %b %N"
#define RAW_FORMAT                     \
  "%d %i %#p %l %u %g %r %z %a %m %c " \
  "%k %b %f %N"
#define LS_FORMAT "%Sp %l %Su %Sg %Z %Sm %N%SY"
#define LSF_FORMAT "%Sp %l %Su %Sg %Z %Sm %N%T%SY"
#define SHELL_FORMAT                             \
  "st_dev=%d st_ino=%i st_mode=%#p st_nlink=%l " \
  "st_uid=%u st_gid=%g st_rdev=%r st_size=%z "   \
  "st_atime=%a st_mtime=%m st_ctime=%c "         \
  "st_blksize=%k st_blocks=%b"
#define LINUX_FORMAT                                                        \
  "  File: \"%N\"%n"                                                        \
  "  Size: %-11z  FileType: %HT%n"                                          \
  "  Mode: (%01Mp%03OLp/%.10Sp)         Uid: (%5u/%8Su)  Gid: (%5g/%8Sg)%n" \
  "Device: %Hd,%Ld   Inode: %i    Links: %l%n"                              \
  "Access: %Sa%n"                                                           \
  "Modify: %Sm%n"                                                           \
  "Change: %Sc"

#define TIME_FORMAT "%b %e %T %Y"

#define FLAG_POUND 0x01
#define FLAG_SPACE 0x02
#define FLAG_PLUS 0x04
#define FLAG_ZERO 0x08
#define FLAG_MINUS 0x10

/*
 * These format characters must all be unique, except the magic one.
 */
#define FMT_MAGIC '%'
#define FMT_DOT '.'

#define SIMPLE_NEWLINE 'n'
#define SIMPLE_TAB 't'
#define SIMPLE_PERCENT '%'
#define SIMPLE_NUMBER '@'

#define FMT_POUND '#'
#define FMT_SPACE ' '
#define FMT_PLUS '+'
#define FMT_ZERO '0'
#define FMT_MINUS '-'

#define FMT_DECIMAL 'D'
#define FMT_OCTAL 'O'
#define FMT_UNSIGNED 'U'
#define FMT_HEX 'X'
#define FMT_FLOAT 'F'
#define FMT_STRING 'S'

#define FMTF_DECIMAL 0x01
#define FMTF_OCTAL 0x02
#define FMTF_UNSIGNED 0x04
#define FMTF_HEX 0x08
#define FMTF_FLOAT 0x10
#define FMTF_STRING 0x20

#define HIGH_PIECE 'H'
#define MIDDLE_PIECE 'M'
#define LOW_PIECE 'L'

#define SHOW_st_dev 'd'
#define SHOW_st_ino 'i'
#define SHOW_st_mode 'p'
#define SHOW_st_nlink 'l'
#define SHOW_st_uid 'u'
#define SHOW_st_gid 'g'
#define SHOW_st_rdev 'r'
#define SHOW_st_atime 'a'
#define SHOW_st_mtime 'm'
#define SHOW_st_ctime 'c'
#define SHOW_st_size 'z'
#define SHOW_st_blocks 'b'
#define SHOW_st_blksize 'k'
#define SHOW_symlink 'Y'
#define SHOW_filetype 'T'
#define SHOW_filename 'N'
#define SHOW_sizerdev 'Z'

void usage(const char *);
void output(const struct stat *, const char *, const char *, int, int);
int format1(const struct stat *, /* stat info */
            const char *,        /* the file name */
            const char *, int,   /* the format string itself */
            char *, size_t,      /* a place to put the output */
            int, int, int, int,  /* the parsed format */
            int, int);

char *timefmt;

#define addchar(s, c, nl)  \
  do {                     \
    (void)fputc((c), (s)); \
    (*nl) = ((c) == '\n'); \
  } while (0 /*CONSTCOND*/)

extern const char *__progname;

int main(int argc, char *argv[]) {
  setprogname(argv[0]);
  struct stat st;
  int ch, rc, errs;
  int lsF, fmtchar, usestat, fn, nonl, quiet;
  char *statfmt, *options, *synopsis;

  lsF = 0;
  fmtchar = '\0';
  usestat = 0;
  nonl = 0;
  quiet = 0;
  statfmt = NULL;
  timefmt = NULL;

  options = "f:FlLnqrst:x";
  synopsis =
      "[-FLnq] [-f format | -l | -r | -s | -x] "
      "[-t timefmt] [file ...]";

  while ((ch = getopt(argc, argv, options)) != -1) switch (ch) {
      case 'F':
        lsF = 1;
        break;
      case 'L':
        usestat = 1;
        break;
      case 'n':
        nonl = 1;
        break;
      case 'q':
        quiet = 1;
        break;
      case 'f':
        statfmt = optarg;
        /* FALLTHROUGH */
      case 'l':
      case 'r':
      case 's':
      case 'x':
        if (fmtchar != 0)
          errx(1, "can't use format '%c' with '%c'", fmtchar, ch);
        fmtchar = ch;
        break;
      case 't':
        timefmt = optarg;
        break;
      default:
        usage(synopsis);
    }

  argc -= optind;
  argv += optind;
  fn = 1;

  if (fmtchar == '\0') {
    if (lsF)
      fmtchar = 'l';
    else {
      fmtchar = 'f';
      statfmt = DEF_FORMAT;
    }
  }

  if (lsF && fmtchar != 'l') errx(1, "can't use format '%c' with -F", fmtchar);

  switch (fmtchar) {
    case 'f':
      /* statfmt already set */
      break;
    case 'l':
      statfmt = lsF ? LSF_FORMAT : LS_FORMAT;
      break;
    case 'r':
      statfmt = RAW_FORMAT;
      break;
    case 's':
      statfmt = SHELL_FORMAT;
      break;
    case 'x':
      statfmt = LINUX_FORMAT;
      if (timefmt == NULL) timefmt = "%c";
      break;
    default:
      usage(synopsis);
      /*NOTREACHED*/
  }

  if (timefmt == NULL) timefmt = TIME_FORMAT;

  errs = 0;
  do {
    if (argc == 0)
      rc = fstat(STDIN_FILENO, &st);
    else if (usestat) {
      /*
       * Try stat() and if it fails, fall back to
       * lstat() just in case we're examining a
       * broken symlink.
       */
      if ((rc = stat(argv[0], &st)) == -1 && errno == ENOENT &&
          (rc = lstat(argv[0], &st)) == -1)
        errno = ENOENT;
    } else
      rc = lstat(argv[0], &st);

    if (rc == -1) {
      errs = 1;
      if (!quiet) warn("%s", argc == 0 ? "(stdin)" : argv[0]);
    } else
      output(&st, argv[0], statfmt, fn, nonl);

    argv++;
    argc--;
    fn++;
  } while (argc > 0);

  return (errs);
}

void usage(const char *synopsis) {
  (void)fprintf(stderr, "usage: %s %s\n", __progname, synopsis);
  exit(1);
}

/*
 * Parses a format string.
 */
void output(const struct stat *st, const char *file, const char *statfmt,
            int fn, int nonl) {
  int flags, size, prec, ofmt, hilo, what;
  char buf[PATH_MAX + 4 + 1];
  const char *subfmt;
  int nl, t, i;

  nl = 1;
  while (*statfmt != '\0') {
    /*
     * Non-format characters go straight out.
     */
    if (*statfmt != FMT_MAGIC) {
      addchar(stdout, *statfmt, &nl);
      statfmt++;
      continue;
    }

    /*
     * The current format "substring" starts here,
     * and then we skip the magic.
     */
    subfmt = statfmt;
    statfmt++;

    /*
     * Some simple one-character "formats".
     */
    switch (*statfmt) {
      case SIMPLE_NEWLINE:
        addchar(stdout, '\n', &nl);
        statfmt++;
        continue;
      case SIMPLE_TAB:
        addchar(stdout, '\t', &nl);
        statfmt++;
        continue;
      case SIMPLE_PERCENT:
        addchar(stdout, '%', &nl);
        statfmt++;
        continue;
      case SIMPLE_NUMBER: {
        char num[12], *p;

        snprintf(num, sizeof(num), "%d", fn);
        for (p = &num[0]; *p; p++) addchar(stdout, *p, &nl);
        statfmt++;
        continue;
      }
    }

    /*
     * This must be an actual format string.  Format strings are
     * similar to printf(3) formats up to a point, and are of
     * the form:
     *
     *	%	required start of format
     *	[-# +0]	opt. format characters
     *	size	opt. field width
     *	.	opt. decimal separator, followed by
     *	prec	opt. precision
     *	fmt	opt. output specifier (string, numeric, etc.)
     *	sub	opt. sub field specifier (high, middle, low)
     *	datum	required field specifier (size, mode, etc)
     *
     * Only the % and the datum selector are required.  All data
     * have reasonable default output forms.  The "sub" specifier
     * only applies to certain data (mode, dev, rdev, filetype).
     * The symlink output defaults to STRING, yet will only emit
     * the leading " -> " if STRING is explicitly specified.  The
     * sizerdev datum will generate rdev output for character or
     * block devices, and size output for all others.
     */
    flags = 0;
    do {
      if (*statfmt == FMT_POUND)
        flags |= FLAG_POUND;
      else if (*statfmt == FMT_SPACE)
        flags |= FLAG_SPACE;
      else if (*statfmt == FMT_PLUS)
        flags |= FLAG_PLUS;
      else if (*statfmt == FMT_ZERO)
        flags |= FLAG_ZERO;
      else if (*statfmt == FMT_MINUS)
        flags |= FLAG_MINUS;
      else
        break;
      statfmt++;
    } while (1 /*CONSTCOND*/);

    size = -1;
    if (isdigit((unsigned char)*statfmt)) {
      size = 0;
      while (isdigit((unsigned char)*statfmt)) {
        size = (size * 10) + (*statfmt - '0');
        statfmt++;
        if (size < 0) goto badfmt;
      }
    }

    prec = -1;
    if (*statfmt == FMT_DOT) {
      statfmt++;

      prec = 0;
      while (isdigit((unsigned char)*statfmt)) {
        prec = (prec * 10) + (*statfmt - '0');
        statfmt++;
        if (prec < 0) goto badfmt;
      }
    }

#define fmtcase(x, y) \
  case (y):           \
    (x) = (y);        \
    statfmt++;        \
    break
#define fmtcasef(x, y, z) \
  case (y):               \
    (x) = (z);            \
    statfmt++;            \
    break
    switch (*statfmt) {
      fmtcasef(ofmt, FMT_DECIMAL, FMTF_DECIMAL);
      fmtcasef(ofmt, FMT_OCTAL, FMTF_OCTAL);
      fmtcasef(ofmt, FMT_UNSIGNED, FMTF_UNSIGNED);
      fmtcasef(ofmt, FMT_HEX, FMTF_HEX);
      fmtcasef(ofmt, FMT_FLOAT, FMTF_FLOAT);
      fmtcasef(ofmt, FMT_STRING, FMTF_STRING);
      default:
        ofmt = 0;
        break;
    }

    switch (*statfmt) {
      fmtcase(hilo, HIGH_PIECE);
      fmtcase(hilo, MIDDLE_PIECE);
      fmtcase(hilo, LOW_PIECE);
      default:
        hilo = 0;
        break;
    }

    switch (*statfmt) {
      fmtcase(what, SHOW_st_dev);
      fmtcase(what, SHOW_st_ino);
      fmtcase(what, SHOW_st_mode);
      fmtcase(what, SHOW_st_nlink);
      fmtcase(what, SHOW_st_uid);
      fmtcase(what, SHOW_st_gid);
      fmtcase(what, SHOW_st_rdev);
      fmtcase(what, SHOW_st_atime);
      fmtcase(what, SHOW_st_mtime);
      fmtcase(what, SHOW_st_ctime);
      fmtcase(what, SHOW_st_size);
      fmtcase(what, SHOW_st_blocks);
      fmtcase(what, SHOW_st_blksize);
      fmtcase(what, SHOW_symlink);
      fmtcase(what, SHOW_filetype);
      fmtcase(what, SHOW_filename);
      fmtcase(what, SHOW_sizerdev);
      default:
        goto badfmt;
    }
#undef fmtcasef
#undef fmtcase

    t = format1(st, file, subfmt, statfmt - subfmt, buf, sizeof(buf), flags,
                size, prec, ofmt, hilo, what);

    for (i = 0; i < t && i < sizeof(buf) - 1; i++) addchar(stdout, buf[i], &nl);

    continue;

  badfmt:
    errx(1, "%.*s: bad format", (int)(statfmt - subfmt + 1), subfmt);
  }

  if (!nl && !nonl) (void)fputc('\n', stdout);
  (void)fflush(stdout);
}

/*
 * Arranges output according to a single parsed format substring.
 */
int format1(const struct stat *st, const char *file, const char *fmt, int flen,
            char *buf, size_t blen, int flags, int size, int prec, int ofmt,
            int hilo, int what) {
  u_int64_t data;
  char lfmt[24], tmp[20];
  char smode[12], sid[12], path[PATH_MAX + 4];
  const char *sdata;
  struct tm *tm;
  time_t secs;
  long nsecs;
  int l, small, formats, gottime, n;

  formats = 0;
  small = 0;
  gottime = 0;
  secs = 0;
  nsecs = 0;

  /*
   * First, pick out the data and tweak it based on hilo or
   * specified output format (symlink output only).
   */
  switch (what) {
    case SHOW_st_dev:
    case SHOW_st_rdev:
      small = (sizeof(st->st_dev) == 4);
      data = (what == SHOW_st_dev) ? st->st_dev : st->st_rdev;
// WASI doesn't have devname:
//       sdata = (what == SHOW_st_dev)
//                   ? devname(st->st_dev, S_IFBLK)
//                   : devname(st->st_rdev, S_ISCHR(st->st_mode)   ? S_IFCHR
//                                          : S_ISBLK(st->st_mode) ? S_IFBLK
//                                                                 : 0U);
      sdata = NULL;
      if (sdata == NULL) sdata = "???";
      if (hilo == HIGH_PIECE) {
        data = major(data);
        hilo = 0;
      } else if (hilo == LOW_PIECE) {
        data = minor((unsigned)data);
        hilo = 0;
      }
      formats =
          FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX | FMTF_STRING;
      if (ofmt == 0) ofmt = FMTF_UNSIGNED;
      break;
    case SHOW_st_ino:
      small = (sizeof(st->st_ino) == 4);
      data = st->st_ino;
      sdata = NULL;
      formats = FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX;
      if (ofmt == 0) ofmt = FMTF_UNSIGNED;
      break;
    case SHOW_st_mode:
      small = (sizeof(st->st_mode) == 4);
      data = st->st_mode;
      strmode(st->st_mode, smode);
      l = strlen(smode);
      if (smode[l - 1] == ' ') smode[--l] = '\0';
      switch (hilo) {
        case HIGH_PIECE:
          data >>= 12;
          smode[4] = '\0';
          sdata = smode + 1;
          break;
        case MIDDLE_PIECE:
          data = (data >> 9) & 07;
          smode[7] = '\0';
          sdata = smode + 4;
          break;
        case LOW_PIECE:
          data &= 0777;
          smode[10] = '\0';
          sdata = smode + 7;
          break;
        default:
          sdata = smode;
          break;
      }
      hilo = 0;
      formats =
          FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX | FMTF_STRING;
      if (ofmt == 0) ofmt = FMTF_OCTAL;
      break;
    case SHOW_st_nlink:
      small = (sizeof(st->st_dev) == 4);
      data = st->st_nlink;
      sdata = NULL;
      formats = FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX;
      if (ofmt == 0) ofmt = FMTF_UNSIGNED;
      break;
    case SHOW_st_uid:
      small = (sizeof(st->st_uid) == 4);
      data = st->st_uid;
      sdata = user_from_uid(st->st_uid, 1);
      if (sdata == NULL) {
        snprintf(sid, sizeof(sid), "(%ld)", (long)st->st_uid);
        sdata = sid;
      }
      formats =
          FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX | FMTF_STRING;
      if (ofmt == 0) ofmt = FMTF_UNSIGNED;
      break;
    case SHOW_st_gid:
      small = (sizeof(st->st_gid) == 4);
      data = st->st_gid;
      sdata = group_from_gid(st->st_gid, 1);
      if (sdata == NULL) {
        snprintf(sid, sizeof(sid), "(%ld)", (long)st->st_gid);
        sdata = sid;
      }
      formats =
          FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX | FMTF_STRING;
      if (ofmt == 0) ofmt = FMTF_UNSIGNED;
      break;
    case SHOW_st_atime:
      gottime = 1;
      secs = st->st_atime;
      nsecs = st->st_atim.tv_nsec;
      /* FALLTHROUGH */
    case SHOW_st_mtime:
      if (!gottime) {
        gottime = 1;
        secs = st->st_mtime;
        nsecs = st->st_mtim.tv_nsec;
      }
      /* FALLTHROUGH */
    case SHOW_st_ctime:
      if (!gottime) {
        gottime = 1;
        secs = st->st_ctime;
        nsecs = st->st_ctim.tv_nsec;
      }
      small = (sizeof(secs) == 4);
      data = secs;
      small = 1;
      tm = localtime(&secs);
      (void)strftime(path, sizeof(path), timefmt, tm);
      sdata = path;
      formats = FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX |
                FMTF_FLOAT | FMTF_STRING;
      if (ofmt == 0) ofmt = FMTF_DECIMAL;
      break;
    case SHOW_st_size:
      small = (sizeof(st->st_size) == 4);
      data = st->st_size;
      sdata = NULL;
      formats = FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX;
      if (ofmt == 0) ofmt = FMTF_UNSIGNED;
      break;
    case SHOW_st_blocks:
      small = (sizeof(st->st_blocks) == 4);
      data = st->st_blocks;
      sdata = NULL;
      formats = FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX;
      if (ofmt == 0) ofmt = FMTF_UNSIGNED;
      break;
    case SHOW_st_blksize:
      small = (sizeof(st->st_blksize) == 4);
      data = st->st_blksize;
      sdata = NULL;
      formats = FMTF_DECIMAL | FMTF_OCTAL | FMTF_UNSIGNED | FMTF_HEX;
      if (ofmt == 0) ofmt = FMTF_UNSIGNED;
      break;
    case SHOW_symlink:
      small = 0;
      data = 0;
      if (S_ISLNK(st->st_mode)) {
        snprintf(path, sizeof(path), " -> ");
        l = readlink(file, path + 4, sizeof(path) - 4 - 1);
        if (l == -1) {
          l = 0;
          path[0] = '\0';
        }
        path[l + 4] = '\0';
        sdata = path + (ofmt == FMTF_STRING ? 0 : 4);
      } else
        sdata = "";

      formats = FMTF_STRING;
      if (ofmt == 0) ofmt = FMTF_STRING;
      break;
    case SHOW_filetype:
      small = 0;
      data = 0;
      sdata = smode;
      smode[0] = '\0';
      if (hilo == 0 || hilo == LOW_PIECE) {
        switch (st->st_mode & S_IFMT) {
          case S_IFIFO:
            (void)strlcat(smode, "|", sizeof(smode));
            break;
          case S_IFDIR:
            (void)strlcat(smode, "/", sizeof(smode));
            break;
          case S_IFREG:
            if (st->st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
              (void)strlcat(smode, "*", sizeof(smode));
            break;
          case S_IFLNK:
            (void)strlcat(smode, "@", sizeof(smode));
            break;
//           case S_IFSOCK:
//             (void)strlcat(smode, "=", sizeof(smode));
//             break;
        }
        hilo = 0;
      } else if (hilo == HIGH_PIECE) {
        switch (st->st_mode & S_IFMT) {
          case S_IFIFO:
            sdata = "Fifo File";
            break;
          case S_IFCHR:
            sdata = "Character Device";
            break;
          case S_IFDIR:
            sdata = "Directory";
            break;
          case S_IFBLK:
            sdata = "Block Device";
            break;
          case S_IFREG:
            sdata = "Regular File";
            break;
          case S_IFLNK:
            sdata = "Symbolic Link";
            break;
//           case S_IFSOCK:
//             sdata = "Socket";
//             break;
          default:
            sdata = "???";
            break;
        }
        hilo = 0;
      }
      formats = FMTF_STRING;
      if (ofmt == 0) ofmt = FMTF_STRING;
      break;
    case SHOW_filename:
      small = 0;
      data = 0;
      if (file == NULL)
        (void)strlcpy(path, "(stdin)", sizeof(path));
      else
        (void)strlcpy(path, file, sizeof(path));
      sdata = path;
      formats = FMTF_STRING;
      if (ofmt == 0) ofmt = FMTF_STRING;
      break;
    case SHOW_sizerdev:
      if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode)) {
        char majdev[20], mindev[20];
        int l1, l2;

        l1 = format1(st, file, fmt, flen, majdev, sizeof(majdev), flags, size,
                     prec, ofmt, HIGH_PIECE, SHOW_st_rdev);
        l2 = format1(st, file, fmt, flen, mindev, sizeof(mindev), flags, size,
                     prec, ofmt, LOW_PIECE, SHOW_st_rdev);
        n = snprintf(buf, blen, "%.*s,%.*s", l1, majdev, l2, mindev);
        return (n >= blen ? blen : n);
      } else {
        return (format1(st, file, fmt, flen, buf, blen, flags, size, prec, ofmt,
                        0, SHOW_st_size));
      }
      /*NOTREACHED*/
    default:
      errx(1, "%.*s: bad format", (int)flen, fmt);
  }

  /*
   * If a subdatum was specified but not supported, or an output
   * format was selected that is not supported, that's an error.
   */
  if (hilo != 0 || (ofmt & formats) == 0)
    errx(1, "%.*s: bad format", (int)flen, fmt);

  /*
   * Assemble the format string for passing to printf(3).
   */
  lfmt[0] = '\0';
  (void)strlcat(lfmt, "%", sizeof(lfmt));
  if (flags & FLAG_POUND) (void)strlcat(lfmt, "#", sizeof(lfmt));
  if (flags & FLAG_SPACE) (void)strlcat(lfmt, " ", sizeof(lfmt));
  if (flags & FLAG_PLUS) (void)strlcat(lfmt, "+", sizeof(lfmt));
  if (flags & FLAG_MINUS) (void)strlcat(lfmt, "-", sizeof(lfmt));
  if (flags & FLAG_ZERO) (void)strlcat(lfmt, "0", sizeof(lfmt));

  /*
   * Only the timespecs support the FLOAT output format, and that
   * requires work that differs from the other formats.
   */
  if (ofmt == FMTF_FLOAT) {
    /*
     * Nothing after the decimal point, so just print seconds.
     */
    if (prec == 0) {
      if (size != -1) {
        (void)snprintf(tmp, sizeof(tmp), "%d", size);
        (void)strlcat(lfmt, tmp, sizeof(lfmt));
      }
      (void)strlcat(lfmt, "d", sizeof(lfmt));
      n = snprintf(buf, blen, lfmt, secs);
      return (n >= blen ? blen : n);
    }

    /*
     * Unspecified precision gets all the precision we have:
     * 9 digits.
     */
    if (prec == -1) prec = 9;

    /*
     * Adjust the size for the decimal point and the digits
     * that will follow.
     */
    size -= prec + 1;

    /*
     * Any leftover size that's legitimate will be used.
     */
    if (size > 0) {
      (void)snprintf(tmp, sizeof(tmp), "%d", size);
      (void)strlcat(lfmt, tmp, sizeof(lfmt));
    }
    (void)strlcat(lfmt, "d", sizeof(lfmt));

    /*
     * The stuff after the decimal point always needs zero
     * filling.
     */
    (void)strlcat(lfmt, ".%0", sizeof(lfmt));

    /*
     * We can "print" at most nine digits of precision.  The
     * rest we will pad on at the end.
     */
    (void)snprintf(tmp, sizeof(tmp), "%dd", prec > 9 ? 9 : prec);
    (void)strlcat(lfmt, tmp, sizeof(lfmt));

    /*
     * For precision of less that nine digits, trim off the
     * less significant figures.
     */
    for (; prec < 9; prec++) nsecs /= 10;

    /*
     * Use the format, and then tack on any zeroes that
     * might be required to make up the requested precision.
     */
    l = snprintf(buf, blen, lfmt, secs, nsecs);
    if (l >= blen) return (l);
    for (; prec > 9 && l < blen; prec--, l++) (void)strlcat(buf, "0", blen);
    return (l);
  }

  /*
   * Add on size and precision, if specified, to the format.
   */
  if (size != -1) {
    (void)snprintf(tmp, sizeof(tmp), "%d", size);
    (void)strlcat(lfmt, tmp, sizeof(lfmt));
  }
  if (prec != -1) {
    (void)snprintf(tmp, sizeof(tmp), ".%d", prec);
    (void)strlcat(lfmt, tmp, sizeof(lfmt));
  }

  /*
   * String output uses the temporary sdata.
   */
  if (ofmt == FMTF_STRING) {
    if (sdata == NULL) errx(1, "%.*s: bad format", (int)flen, fmt);
    (void)strlcat(lfmt, "s", sizeof(lfmt));
    n = snprintf(buf, blen, lfmt, sdata);
    return (n >= blen ? blen : n);
  }

  /*
   * Ensure that sign extension does not cause bad looking output
   * for some forms.
   */
  if (small && ofmt != FMTF_DECIMAL) data = (u_int32_t)data;

  /*
   * The four "numeric" output forms.
   */
  (void)strlcat(lfmt, "ll", sizeof(lfmt));
  switch (ofmt) {
    case FMTF_DECIMAL:
      (void)strlcat(lfmt, "d", sizeof(lfmt));
      break;
    case FMTF_OCTAL:
      (void)strlcat(lfmt, "o", sizeof(lfmt));
      break;
    case FMTF_UNSIGNED:
      (void)strlcat(lfmt, "u", sizeof(lfmt));
      break;
    case FMTF_HEX:
      (void)strlcat(lfmt, "x", sizeof(lfmt));
      break;
  }

  n = snprintf(buf, blen, lfmt, data);
  return (n >= blen ? blen : n);
}
